[jira] Assigned: (TS-46) increase cache partition size to avoid write-aggregation seeks

["John Plevyak (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TS-46?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

John Plevyak reassigned TS-46:
------------------------------

    Assignee: John Plevyak

> increase cache partition size to avoid write-aggregation seeks
> --------------------------------------------------------------
>
>                 Key: TS-46
>                 URL: https://issues.apache.org/jira/browse/TS-46
>             Project: Traffic Server
>          Issue Type: Improvement
>          Components: Cache
>         Environment: all
>            Reporter: John Plevyak
>            Assignee: John Plevyak
>         Attachments: ts-partition-size-jp-v1.patch, ts-partition-size-jp-v2.patch, ts-partition-size-jp-v3.patch, ts-partition-size-jp-v4.patch
>
>   Original Estimate: 168h
>  Remaining Estimate: 168h
>
> Currently cache partitions are 8GB.  Because each has a write pointer, this means on a decent size
> disk there are a hundred or more write pointers which means a lot of seeking for writes
> (which really should be aggregated).  The proposal is to make it possible to have large partitions
> (up to .5 PB) by increasing the side of the cache directory entry from 8 to 10 bytes and using the
> additional bits for the offset. 

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